andy_c wrote:
PhilNYC Wrote:
Here's a good article describing why you should use a 1.5m digital
cable....
http://www.positive-feedback.com/Issue14/spdif.htm
Yikes. ... [snip] .. engineer .... knows that the
information in that linked article is completely false.
The referenced article smells like snake oil to me, as well.
No reason to degenerate into dualing experts.
S/PDIF is a consumer mass market spec. It was designed to
be everywhere and to be 'good enough'. It was primarily designed
to be cheap.
The idea that magic metals in the cable makes a cable 'digital' is
simply marketing spin. All cables are analog. You put a voltage
on a wire, and it flows (or the electronics flow, or the electron holes
flow the other way, depending on your point of view.). The only thing
digital is the signaling, which is the interpretation of the
analog signal. With proper engineering, you can meet specs.
By most standards, the SPDIF signal is just barely in the RF world, or
at least not in serious RF mode. There are only 1.5 mega bits per
second, just above the AM radio band.
There is also the minor detail that no wire with RCA connectors on it
can be 75 ohm, which is the spec for S/PDIF. RCA connectors have
advantages (which is why the WW2 signal corp veterans who created 'hi
fi' used them, but they can't be 75 ohm impedance, the size is wrong.
So no matter what the conductors are made out of, or what magic super
insulator covers it, there are impedance mismatches. Its a feature.
--
Pat
http://www.pfarrell.com/music/slimserver/slimsoftware.html
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